linux-kernel - Re: [PATCH 1/3] clk: berlin: add cpuclk

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Date:	Mon, 10 Aug 2015 21:55:16 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	mturquette@...libre.com, sboyd@...eaurora.org
CC:	zmxu@...vell.com, jszhang@...vell.com,
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: berlin: add cpuclk

On 30.07.2015 14:35, Antoine Tenart wrote:
> Add cpuclk in the Berlin BG2Q clock driver. This clk has a divider
> fixed to 1.
>
> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> ---
>   drivers/clk/berlin/bg2q.c            | 14 +++++++-------
>   include/dt-bindings/clock/berlin2q.h |  3 ++-
>   2 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/clk/berlin/bg2q.c b/drivers/clk/berlin/bg2q.c
> index 221f40c2b850..72d2f3500db8 100644
> --- a/drivers/clk/berlin/bg2q.c
> +++ b/drivers/clk/berlin/bg2q.c
> @@ -45,7 +45,7 @@
>   #define REG_SDIO0XIN_CLKCTL	0x0158
>   #define REG_SDIO1XIN_CLKCTL	0x015c
>
> -#define	MAX_CLKS 27
> +#define	MAX_CLKS 28

Following Stephen's suggesting, how about moving this to the
dt-bindings include?

>   static struct clk *clks[MAX_CLKS];
>   static struct clk_onecell_data clk_data;
>   static DEFINE_SPINLOCK(lock);
> @@ -356,13 +356,13 @@ static void __init berlin2q_clock_setup(struct device_node *np)
>   			    gd->bit_idx, 0, &lock);
>   	}
>
> -	/*
> -	 * twdclk is derived from cpu/3
> -	 * TODO: use cpupll until cpuclk is not available
> -	 */
> +	/* cpuclk divider is fixed to 1 */
> +	clks[CLKID_CPU] =
> +		clk_register_fixed_factor(NULL, "cpu", clk_names[CPUPLL],
> +					  0, 1, 1);
> +	/* twdclk is derived from cpu/3 */
>   	clks[CLKID_TWD] =
> -		clk_register_fixed_factor(NULL, "twd", clk_names[CPUPLL],
> -					  0, 1, 3);
> +		clk_register_fixed_factor(NULL, "twd", "cpu", 0, 1, 3);
>
>   	/* check for errors on leaf clocks */
>   	for (n = 0; n < MAX_CLKS; n++) {
> diff --git a/include/dt-bindings/clock/berlin2q.h b/include/dt-bindings/clock/berlin2q.h
> index 287fc3b4afb2..a80c3272794d 100644
> --- a/include/dt-bindings/clock/berlin2q.h
> +++ b/include/dt-bindings/clock/berlin2q.h
> @@ -28,4 +28,5 @@
>   #define CLKID_NFC		23
>   #define CLKID_SMEMC		24
>   #define CLKID_PCIE		25
> -#define CLKID_TWD		26
> +#define CLKID_CPU		26
> +#define CLKID_TWD		27

Is there any good reason to brake existing dts[i] by moving TWD to 27
instead of adding CPU as 27?

Sebastian
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